Process of removing rosin and turpentine from resinous woods.



RENEWED FEB. 10,1915.

APPLICATION FILED MAY II, 1912.

Patented Apr. 27, 1915.

5 H van 01 are interposed between WILLIAM M. BASHLIN, OF GROVE CITY,PENNSYLVANIA.

manned.

Specification of Iietters Iatent.

Patented Apr. 27, 1915'.

Application filed May 11, 1912, Serial No. 696,747. Renewed February 10,1915. Serial No. 7,371.

To all whom it may concern Be it known that 1, WILLIAM M. BAsHLIN, acitizen of the United States, residing. at Grove City, in the county ofMercer and State of Pennsylvania, have invented new and usefulImprovements in the Process of Removing Rosin and Turpentine fromResinous Woods, of which the following. is a specification.

This invention relates to the process of removing turpentine and rosinfrom resinous woods and consists in therein as will be hereinafter fullydescribed and pointed out in the claims.

Ihave shown an apparatus for carrying out my process in an March 29th,1912, Serial Number 687,085. This apparatus is illustrated in theaccompanying drawings and consists in an inner shell 1 which ispreferably cylindrical in form and is closed at top and bottom bysuitable heads 2 and 3, one of these heads, the head 2 in the presentinstance, being preferably provided with a dome 4 which is covered by atight-fitting lid 5, the latter being held in position by a suitableclamp 6. One side of the retort is also preferably provided with amanhole '1 which may be conveniently located toward the bottom of theretort and communicates with the interior thereof. This manhole iscovered by a'tight fitting lid 8 which may also be held in position by aclamp 9. The retort is practically in'closedby an outer jacket 10 whichforms a heating space or chamber 11 which is adapted to receive whichmay be connected to any suitable source of steam supply such, forexample, as the steam pipe 13. The bottom of the retort contains asupport for the charge of wood and this support, according to thepresent invention, serves'also as a filter or strainer. In the presentinstance, the support embodies a suitable number of superposed v plates14 which are foraminous or formed with perforationsl 5, theseperforations in the plates being preferably staggeredor offset, asshown. A sheet of fabric 16 of appropriate character is preferablyarranged at the under side of the uppermost foraminous plate and sheetsv of woven wire mesh 17 top and bottom plates. This structure justdescribed is suitably supported in the lower portion of the retort, forexample, by an internal flange or ledge 18 and the plates and certainimprovements application filed by me steamthrough a pipe 12 thereto boththe middle and the the mesh are maintained in proper spaced relation bysuitable means such, for example, as the rings 19. A residuum chamber 20is formed in the bottom of the retort below the support just described,and an outlet 21 is provided for drawing oil the residuum. The residuumchamber .20 contains piping which is preferably in the form of a coil 22having vents or orifices 23, this coil being connected by a. pipe 24: toreceive the steam supply pipe 13 whereby steam may be admitted to thecoil 22 and this steam may be projected from the vents or orifices 23therein through the charge support and filter. An outlet 25 also extendsthrough the bottom or lower portion of the retort and serves to withdrawthe solvent or liquid therefrom, this outlet being shown provided with astrainer head 26 and a blower 27 may be arranged in cooperative relationwith the strainer head, the blower being connected by a pipe 28 to thesteam pipe 24 and steam may be admitted to the blower under the controlof a valve 29 .whereby the accumulation of any substance on the strainerhead tending to clog the same can be removed when necessary. The outletpipe 25 for the solvent preferably leads to a suitable circulating pump30 and the discharge side of this pump is connectedby a pipe 31 to theinlet 32 of the present instance being formed with numerous downwardlydirected vents or orifices 34 through which the solvent may bedistributed evenly over the charge contained in the retort. a

That portion of the retort between the lower and upper coils 22 and 33contains means for heating the interior of a charge or body of woodcontained inthe retort whereby all portions of the charge may be heateduniformly by the application of heat exteriorly and interiorly.

eating means of different kinds may be used for applying heat interiorlyto the charge. In-the present instance, an imperforate helical heatingcoil 35 is shown and this coil may receive steam at an appropriatetemperature through the pipes 36 and 37 i quently the heating effect ortemperature of the coil may be regulated as conditions may require.Means 1s also provided for inthese pipes in the presentinstanceradiating from the centerof-the retort and provided with ventsor orifices 42 through which the steam is discharged and, distributesuniformly within the body of the charge.

. may

3 the The manifolds and the distributing pipes may also serve as meansfor distributing the solvent throughout the body of the charge and toaccomplish these results, a pipe 43 be used which leads to the manifoldsand this pipe is connected to and may receive steam from the supply pipe13 under the control of a suitable valve 44, and

, pipe 43 is also solvent circulating pump 30 and may receive solventtherefrom under the control of a valve 45. When the valve 45 is closedand the valve 44 is opened, steam from the pipe 13- is admitted to themanifolds 40 and is discharged eyenly-throughout the body of the chargethrough the perforated distributing pipes 41. By closingthe steam valve44 and opening thevalve 45, t 'e solvent may be caused to enter themanifolds 40 and discharge directly into the mass through thedistributing pipes. A pipe 46 leads from the dome 4 and is preferablyconnected to a suitable vacuum pump whereby a pressure below atmosphericpressure may be maintained within the retort during the treatment ofeach charge. A pipe 47 also leads from-the dome 4 and may serve toconvey away and condense such gases as may accumulate in the dome. Thesegases may be withdrawn by any suitable exhaust device, an

shown in the present instance and the nozzle 49 thereof may receivesteam from the steam pipe 13, as shown. In order to condense and therebyprevent high pressure of any gases that may accumulate in the upperportion of the retort, due to hydrocarbons native to the .wood and thehydrocorbons in 50 may be used, that shown in the present instance beingadapted to receive water or other cooling medium throu'ghtheinlet pipefrom the coil may discharge through the outlet 52. Gage glasses 53 and54 may be provided for indicating I the level of the liquid in the upperand lower portions of the retort, and a safety valve 55 may be providedto prevent the development of excess pressure in the retort. Steam mayalso be introduced by we of the coil 33, pipe 31, valve 31, portion 0pipe-25, valve 45, pipe 45, valve 44, the valve 25*bemg closed. Incarrying out'my process, I preferably connected to the.

ejector 48 being the combined action of the.

the solvent, a cooling coil subject the chips in the retort to thefollowing steps: The'retort being filled, the chips chamberll and coil35. A solvent, preferably the solvent described in my application filedNov.-10th, 1911 #659,634 may be used which solvent is made up 'of80%'deodorized benzin and 20% wood tur entine; With my process. Imaintain the love of the body of solvent at the bottom of the retortnear the bottom of the chips and spray the top of the chips with thesolvent allowing it to percolate down through the chips. In this way,the solvent is continuously moving taking up the rosins and oils in thismovement and at the same time, the chips are not subjected to thepressure that would be incident to submerging them in the solvent. Theprocess may be made more efficient by re ducing the pressure subjectedduringthis washing process by putting the retort under a vacuum throu hany-convenient apparatus as by way of tie pipe'46. Where this is done,the chips are not only free from any presence of the solvent itself but,of course, are subjected to the reduced pressure incident -to' thepartial. vacuum. At the same time, the solvent is kept in nearly asintimate a contact with the different parts of the chips as though thechips were submerged and the continued movement of the solvent carriesthe products from the chips with it to the bottom where it can be takenoff. The gases exhausted in reducing the pressure in the retort arecondensed and utilized. This process not only has the advantage of thegreater efficiency as before described but it involves the use of a verysmall amount of solvent compared with the process where the chips aresubmerged. This being so, the after treatment 0 ferent'products is verymuch simplified. In the carrying-out of this process ordinarily thesolvent may be circulated for sometime, by way of the pipe 25, pump 30,pipe 31 32, 33 and nozzles-34. This ma be continued until the solventhas attaine such richness as to interfere with its efliciency when itmay be thrown off for treatment and the fresh solvent introduced. Afterthe products have been extracted from the'chips as far as can be done bythe washing process heretofore described, the solvent is drawn from theretort and the-chips are subjected to a current of steam.

to which the chips are this solvent to take out the dif:

. boiling temperature.

bottom a liquid of the pipe 33.

inseam.

heavier oils. subject the chips to currents ofsteam or heating mediumand to reverse the direction of the movement so as to take up thelighter oils in one .direction take up the heavier oils when applied inthe opposite direction. 0

In carrying out this. process with the apparatus described, I first turnon the steam through the pipe 24, and nozzles 23 allowing the steam topass upwardly and discharge, it through the pipe 47. This How of steammay be augmented by way of the pipe 43, distributing pipes 4'0 and 41and nozzles 42. This would pick up the lighter oils. Steam may thenbezintroducedby way of the pipe 31 and 32 and nozzles 34 discharg-' ingby way of the pipe 21. This would take up the heavier oils with greaterefficiency than where the flow of steam is upwardly. With the flow ofsteam in either direction, the supply may be augmented by the' in troofthe pipe 43'via duction of steam by wa pipe 40, distributing pipes 41and nozzles 42. Steam from this system will follow the direction of thedischarge. ing process alternated as ordinarily remains in the terialthat may be saved. tract this final troduce to the described there chipssome ma- In order to exproduct from the chips, I inretort preferablyfrom the heavier than the solvent and the products, preferably water, atorv about a This water as it rises in the retort picks up the remainingsolution made up of the solvent and the products and carries themupwardly with them through the body of the chips and the richer portionsof this product so picked up may be drawn ofl at the top of the retortby way The amount ofi' can be observed and the process continued untilthe products drawn ofi? are practically free from the solution. Theretort is then emptied, the water being drawn off to a storage forre-use so that the same water is used each time and in this way anysolution that may be maintainedby the water is finally reclaimed. Afterthis the retort is discharged in .the usual manner; preferably throughthe opening 7 and recharged.

What I claim as new is 1. The process of removing rosin and turpentlnefrom resinous woods which consists in subjecting such wood to heat;extracting rosin and turpentine from the wood by the action of apercolating liquid solvent while maintaining the wood in an unsubmergedcondition, the withdrawal of the solvent rich in extract, theapplication of steam in an upward direction to drive ofi' the residue ofWith my process I propose to and to more readily pentine After thissteam of water drawn turpentine and the easily volatilized sub stances,from the wood, theapplication of direction, the applicasteam in adownward V tion of water at about the'boiling point, and

drawing off at the surface of the water the products separated from thewood .by the water.

' 2. The process of remoyingrosin and turpentine from resinous woodswhich consists in subjecting such wood. to a pressure below atmospheric.pressure,- extracting rosin and turpentine from the wood by the actionof a percolating liquid solvent while maintaining the wood in anunsubmerged condition, the withdrawal of the solvent rich in extract,the application of steam'in an upward direction to drive off the residueof turpentine and the easily-volatilized substances from the wood, theapplication of steam in a downward direction, the application of Waterat about the boiling .point, and drawing off at the surface ofthe waterthe products separated from the wood by the water.

3. The process of removing rosin and turfrom resinous woods whichconsists in subjecting such wood to heat and a pressure belowatmospheric pressure; extracting the rosin and turpentine from the woodby the action of a percolating liquid solvent while maintaining the woodin an unsubmerged condition, the withdrawal of the solvent'rich inextract, the application of steam in an upward direction to drive 01fthe residue of turpentine and the easily volatilized substances from thewood, the application of steam in a downward direction, the applicationof water at about the boiling point, and drawing 011 at the surface ofthe water the products separated from the wood unsubmerged condition.

5. The process of removingji'osin and turpcntine from resinous woodswh1ch consists in subjecting the wood to heat at a pressure.

below atmospheric pressure and extracting the rosin and turpentine by apercolating liquid solvent while maintaining the wood 1n an unsubmergedcondition. I

In testimony whereof I have hereunto set my hand in the witnesses. Y

WILIAM M. BASHLIN.

Witnesses:

E. B. HANHAW, Louisa Smears.

presence of two subscribing.

